MEDFORD, Ore. (May. 31, 2026) — Southern Oregon residents can expect a stretch of warmer-than-normal weather early this week before a midweek weather system brings a chance of showers and a return to more seasonable temperatures.
Forecasters said a weak disturbance moving through the region Sunday afternoon generated pockets of cumulus cloud development along the Oregon Cascades and other higher terrain locations. Elsewhere, skies remained mostly clear across valley communities as temperatures climbed through the 70s.
Clear conditions are expected to continue overnight, allowing temperatures to cool quickly. Lows are forecast to fall into the mid-40s west of the Cascades, while communities east of the mountain range could see temperatures drop into the lower and middle 30s.
A warming trend is expected to begin Monday as light easterly winds descending from the Cascade crest help push inland temperatures into the 80s west of the Cascades. Along portions of the southern Oregon coast near Brookings, highs are expected to reach the mid- to upper 70s.
Meteorologists said a thermal trough developing west of the Cascades, combined with a strengthening ridge of high pressure and continued easterly flow aloft, will help maintain the warm conditions through Tuesday. While temperatures are not expected to challenge records, forecast guidance indicates conditions will be noticeably warmer than average for early June.
The pattern is expected to shift Tuesday night as a stronger Pacific storm system approaches the Oregon coast. Forecasters say there is a possibility of showers and isolated thunderstorms developing east of the Cascades by Tuesday afternoon.
Some forecast models also indicate light precipitation could reach areas west of the Cascades by Wednesday, despite relatively low official precipitation probabilities. Meteorologists cautioned that some locations could experience periods of drizzle or brief showers Wednesday morning and afternoon.
After the system moves through, weather conditions are expected to stabilize. A more typical west-to-east flow pattern should develop, bringing temperatures back to seasonal norms and relatively quiet weather Thursday and Friday.
Attention then turns to another Pacific storm system forecast to arrive next weekend. While current model projections focus the heaviest rainfall farther north in the Pacific Northwest, some forecast scenarios suggest southern Oregon could receive more substantial rainfall.
At present, forecasters estimate a 30% to 40% chance of rain along the Cascades next Saturday, with lower probabilities elsewhere. Regardless of precipitation amounts, temperatures are expected to cool noticeably by the weekend, with daytime highs falling back into the lower 70s across much of the region.
Forecasters said confidence remains highest in the early-week warming trend and the cooler conditions expected by next weekend, while precipitation amounts and coverage associated with the upcoming storm systems remain less certain.
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